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Accessory Ossicles, Ankle and Foot
Julia R. Crim, MD; Donna G. Blankenbaker, MD
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KEY FACTS

  • Terminology

    • Imaging

      • Top Differential Diagnoses

        TERMINOLOGY

        • Definitions

          • Accessory center of ossification: Variably present ossific center associated with bone
          • Synchondrosis: Cartilage bridge between 2 bones
            • Commonly found between accessory center of ossification and parent bone
          • Sesamoid: Ossicle arising within tendon, improving its mechanical advantage

        IMAGING

        • General Features

          • Radiographic Findings

            • CT Findings

              • MR Findings

                • Ultrasonographic Findings

                  • Imaging Recommendations

                    • Nuclear Medicine Findings

                      DIFFERENTIAL DIAGNOSIS

                        CLINICAL ISSUES

                        • Presentation

                          DIAGNOSTIC CHECKLIST

                          • Consider

                            • Image Interpretation Pearls

                              • Reporting Tips

                                Selected References

                                1. Cohen BE: Hallux sesamoid disorders. Foot Ankle Clin. 14(1):91-104, 2009
                                2. Nakasa T et al: Painful os intermetatarseum in athletes: report of four cases and review of the literature. Arch Orthop Trauma Surg. 127(4):261-4, 2007
                                3. Chao W: Os trigonum. Foot Ankle Clin. 9(4):787-96, vii, 2004
                                4. Ugolini PA et al: The accessory navicular. Foot Ankle Clin. 9(1):165-80, 2004
                                5. Kono T et al: Symptomatic os subfibulare caused by accessory ossification: a case report. Clin Orthop Relat Res. (399):197-200, 2002
                                6. Hodge JC: Anterior process fracture or calcaneus secundarius: a case report. J Emerg Med. 17(2):305-9, 1999
                                7. Maffulli N et al: Traumatic lesions of some accessory bones of the foot in sports activity. J Am Podiatr Med Assoc. 80(2):86-90, 1990
                                8. Ogden JA et al: Accessory ossification patterns and injuries of the malleoli. J Pediatr Orthop. 10(3):306-16, 1990
                                Related Anatomy
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                                Related Differential Diagnoses
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                                References
                                Tables

                                Tables

                                KEY FACTS

                                • Terminology

                                  • Imaging

                                    • Top Differential Diagnoses

                                      TERMINOLOGY

                                      • Definitions

                                        • Accessory center of ossification: Variably present ossific center associated with bone
                                        • Synchondrosis: Cartilage bridge between 2 bones
                                          • Commonly found between accessory center of ossification and parent bone
                                        • Sesamoid: Ossicle arising within tendon, improving its mechanical advantage

                                      IMAGING

                                      • General Features

                                        • Radiographic Findings

                                          • CT Findings

                                            • MR Findings

                                              • Ultrasonographic Findings

                                                • Imaging Recommendations

                                                  • Nuclear Medicine Findings

                                                    DIFFERENTIAL DIAGNOSIS

                                                      CLINICAL ISSUES

                                                      • Presentation

                                                        DIAGNOSTIC CHECKLIST

                                                        • Consider

                                                          • Image Interpretation Pearls

                                                            • Reporting Tips

                                                              Selected References

                                                              1. Cohen BE: Hallux sesamoid disorders. Foot Ankle Clin. 14(1):91-104, 2009
                                                              2. Nakasa T et al: Painful os intermetatarseum in athletes: report of four cases and review of the literature. Arch Orthop Trauma Surg. 127(4):261-4, 2007
                                                              3. Chao W: Os trigonum. Foot Ankle Clin. 9(4):787-96, vii, 2004
                                                              4. Ugolini PA et al: The accessory navicular. Foot Ankle Clin. 9(1):165-80, 2004
                                                              5. Kono T et al: Symptomatic os subfibulare caused by accessory ossification: a case report. Clin Orthop Relat Res. (399):197-200, 2002
                                                              6. Hodge JC: Anterior process fracture or calcaneus secundarius: a case report. J Emerg Med. 17(2):305-9, 1999
                                                              7. Maffulli N et al: Traumatic lesions of some accessory bones of the foot in sports activity. J Am Podiatr Med Assoc. 80(2):86-90, 1990
                                                              8. Ogden JA et al: Accessory ossification patterns and injuries of the malleoli. J Pediatr Orthop. 10(3):306-16, 1990